Dermatobranchus caesitius is a species of sea slug, a nudibranch, a marine gastropod mollusc in the family Arminidae.Bouchet, P. (2015). Dermatobranchus caesitius. In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2015-09-30
Distribution This species was described from Umgazana on the Indian Ocean coast of South Africa, .
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